+The wcwidth() implementation in ./external/wcwidth.c is from:
+
+ Markus Kuhn -- 2007-05-26 (Unicode 5.0)
+
+ Permission to use, copy, modify, and distribute this software
+ for any purpose and without fee is hereby granted. The author
+ disclaims all warranties with regard to this software.
+
+ Latest version: http://www.cl.cam.ac.uk/~mgk25/ucs/wcwidth.c
+